This bug was fixed in the package systemd - 248.3-1ubuntu7
---
systemd (248.3-1ubuntu7) impish; urgency=medium
* d/tests/tests-in-lxd: suppress the cgroups v2 warning on stderr from
lxd/lxc even more comprehensively until the snapd change required to
do it nicely gets into
** Tags removed: rls-ii-incoming
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https://bugs.launchpad.net/bugs/1940635
Title:
systemd-networkd failing to acquire a DHCP6 lease from dnsmasq on
armhf
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** Changed in: glibc (Ubuntu)
Status: Confirmed => Invalid
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Title:
systemd-networkd failing to acquire a DHCP6 lease from dnsmasq on
** Changed in: netplan.io (Ubuntu)
Status: Confirmed => Fix Released
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Title:
systemd-networkd failing to acquire a DHCP6 lease from
** Tags added: rls-ii-incoming
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Title:
systemd-networkd failing to acquire a DHCP6 lease from dnsmasq on
armhf
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: glibc (Ubuntu)
Status: New => Confirmed
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Title:
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: netplan.io (Ubuntu)
Status: New => Confirmed
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Title:
** Changed in: systemd (Ubuntu)
Status: New => Fix Committed
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Title:
systemd-networkd failing to acquire a DHCP6 lease from dnsmasq on
I filed a bug in systemd (although I'm not really sure it's systemd's
bug) https://github.com/systemd/systemd/issues/20564 and uploaded a
simple workaround (in systemd) that passed systemd armhf autopkgtests in
my PPA. Fingers crossed!
We should come back and review this fix after glibc has
** Tags added: patch
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Title:
systemd-networkd failing to acquire a DHCP6 lease from dnsmasq on
armhf
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So what is going on is this:
In icmp6_receive systemd passes a buffer for control messages to recvmsg
that is only big enough for the messages it expects to receive. glibc
now attempts to append an extra control message to the buffer
(translating SO_TIMESTAMP / COMPAT_SO_TIMESTAMP_OLD to
We must be hitting this line, right?
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/convert_scm_timestamps.c;h=00c934c4135f0d4256068adcf23a3de024fadd43;hb=HEAD#l87
IOW, ddstreet was right in comment #10.
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Beginner error on my part : there are debug logs in networkd, I didn't
even check them. As often, it turns out part of the answer lies in
there.
Here are the logs from 2.33:
autopkgtest systemd-networkd[942]: test_eth42: Gained IPv6LL
autopkgtest systemd-networkd[942]: test_eth42:
** Attachment added: "networkd-glib-2.34-3.trace"
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1940635/+attachment/5521156/+files/networkd-glib-2.34-3.trace
** Attachment removed: "networkd-glib-2.34.trace"
** Attachment added: "networkd-glib-2.33-3.trace"
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1940635/+attachment/5521155/+files/networkd-glib-2.33-3.trace
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Attached are new strace logs, I'll remove the previous files as there
was something wrong with my test setup, so the captured trace isn't
necessarily during the DHCPv6 tests.
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We must build armhf glibc which is y2038 safe, like our v5.1+ kernels
are (bionic-hwe and up). Thus yes, glibc should assume TIME64 SYSCALLS,
on armhf.
Also, maybe our farm can move to focal and focal kernel; or like at
least to bionic-hwe kernel.
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A quick guess would be the problem is glibc upstream commit
13c51549e2077f2f3bf84e8fd0b46d8b0c615912, combined with upstream commit
a26918cfda4bc4b9dad8aae1496e3ef7cbb63d96 setting
__ASSUME_TIME64_SYSCALLS based on the *build* time kernel (not runtime
kernel), and since our build farm runs a
** Attachment added: "networkd-glib-2.34.trace"
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1940635/+attachment/5520981/+files/networkd-glib-2.34.trace
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I can now confirm that the bug has been introduced strictly by the glibc
2.34, and not another package in the -proposed pocket.
My reproduction steps were as following:
Boot an Ubuntu Impish qemu VM (fully up-to-date (funnily enough, far
from being a trivial thing to do, see at the bottom for
** Changed in: netplan.io (Ubuntu)
Assignee: (unassigned) => Simon Chopin (schopin)
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Title:
systemd-networkd failing to acquire a DHCP6
Allright.
I was going to post in-depth investigation results to sum up what
stepping through the code taught me (pretty much nothing, it all goes
well until I lose the stepping thread due to callback/async stuff), but
right before sending the text I let GDB finish the program execution,
and lo
Can somebody confirm my assumptions on the architecture of the test ?
First, it sets up a veth with router_eth42 at one end and test_eth42 at
the other (the itf names might be different ?). dnsmasq is bound against
router_eth42 which is configured manually via iproute with both IPv4 and
IPv6
Is this only seen with glibc 2.34?
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Title:
systemd-networkd failing to acquire a DHCP6 lease from dnsmasq on
armhf
To manage notifications
** Summary changed:
- systemd-networkd failing to acquire a DCHP6 lease from dnsmasq on armhf
+ systemd-networkd failing to acquire a DHCP6 lease from dnsmasq on armhf
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